Shimano SM-EW90-A Di2 Junction Box 3/5 Port

but provides effortless gear shifts, corrosion and stretching, The removal of traditional mechanical cables in favour of electrical wires not only eliminates poor shifting caused by contaminates

This junction A is required to connect the shifters via E-tube wires to the down tube junction wire

3-port design, one for down tube wire to bottom bracket junction, two for shifter connection

Battery level indicator feature

E-tube EW-SD50 wires not included

Additional charging point when using internal battery

Gear index setup switch to allow fine tuning via shifter buttons

Reliable and secure water resistant connectors

Stem mounting strap included